Dynamically updating configuration of a sounding reference signal resource set

ABSTRACT

Aspects relate to mechanisms for wireless communication devices to signal for dynamically updating the configuration of a sound reference signal (SRS) resource set. A user equipment (UE) receives from a base station, via at least one of a downlink control information (DCI) or a medium access control (MAC) control element (MAC-CE), a configuration of one or more sounding reference signal (SRS) resource sets for SRS transmission. The UE also receives an indication of an update of one or more parameters, via at least one of the DCI or the MAC-CE, for at least one SRS resource set of the one or more SRS resource sets. The UE further applies the update to at least one SRS transmission.

TECHNICAL FIELD

The technology discussed below relates generally to wirelesscommunication systems, and more particularly, to techniques forsignaling to dynamically update the configuration of a sound referencesignal (SRS) resource set.

INTRODUCTION

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,broadcasts, or the like. These wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, or the like). Examples of such multiple-access systemsinclude 3rd Generation Partnership Project (3GPP) Long Term Evolution(LTE) systems, LTE Advanced (LTE-A) systems, code division multipleaccess (CDMA) systems, time division multiple access (TDMA) systems,frequency division multiple access (FDMA) systems, orthogonal frequencydivision multiple access (OFDMA) systems, single-carrier frequencydivision multiple access (SC-FDMA) systems, and time divisionsynchronous code division multiple access (TD-SCDMA) systems, to name afew.

In some examples, a wireless multiple-access communication system mayinclude a number of base stations (BSs), which are each capable ofsimultaneously supporting communication for multiple communicationdevices, otherwise known as user equipments (UEs). In an LTE or LTE-Anetwork, a set of one or more base stations may define an eNodeB (eNB).In other examples (e.g., in a next generation, a new radio (NR), or 5Gnetwork), a wireless multiple access communication system may include anumber of distributed units (DUs) (e.g., edge units (EUs), edge nodes(ENs), radio heads (RHs), smart radio heads (SRHs), transmissionreception points (TRPs), etc.) in communication with a number of centralunits (CUs) (e.g., central nodes (CNs), access node controllers (ANCs),or the like), where a set of one or more distributed units, incommunication with a central unit, may define an access node (e.g.,which may be referred to as a base station, 5G NB, next generation NodeB(gNB or gNodeB), TRP, or the like). A base station or distributed unitmay communicate with a set of UEs on downlink channels (e.g., fortransmissions from a base station or to a UE) and uplink channels (e.g.,for transmissions from a UE to a base station or distributed unit).

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. New Radio (NR) (e.g., 5G) is an exampleof an emerging telecommunication standard. NR is a set of enhancementsto the LTE mobile standard promulgated by 3GPP. It is designed to bettersupport mobile broadband Internet access by improving spectralefficiency, lowering costs, improving services, making use of newspectrum, and better integrating with other open standards using OFDMAwith a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL).To these ends, NR supports beamforming, multiple-input multiple-output(MIMO) antenna technology, and carrier aggregation.

BRIEF SUMMARY OF SOME EXAMPLES

The following presents a summary of one or more aspects of the presentdisclosure, in order to provide a basic understanding of such aspects.This summary is not an extensive overview of all contemplated featuresof the disclosure, and is intended neither to identify key or criticalelements of all aspects of the disclosure nor to delineate the scope ofany or all aspects of the disclosure. Its sole purpose is to presentsome concepts of one or more aspects of the disclosure in a form as aprelude to the more detailed description that is presented later.

A method of wireless communication operable at a user equipment (UE) isprovided. The method includes receiving from a base station, via atleast one of a downlink control information (DCI) or a medium accesscontrol (MAC) control element (MAC-CE), a configuration of one or moresounding reference signal (SRS) resource sets for SRS transmission. Themethod also includes receiving an indication of an update of one or moreparameters, via at least one of the DCI or the MAC-CE, for at least oneSRS resource set of the one or more SRS resource sets. The methodfurther includes applying the update to at least one SRS transmission.

In some aspects, the one or more parameters may include a non-zero power(NZP) channel state information reference signal (NZP CSI-RS)identification (NZP CSI-RS ID) associated with the at least one SRSresource set. In some aspects, the at least one SRS resource set mayinclude a resource type of one of aperiodic (AP), semi-persistent (SP),or periodic (P) for a non-codebook physical uplink shared channel(PUSCH) transmission. In some aspects, the method may further include ifthe indication of the update is received via at least the DCI or theMAC-CE, transmitting the at least one SRS transmission to the basestation according to the update at a time period after receiving atleast one of the DCI or the MAC-CE. In some aspects, the time period maybe a function of a frame numerology of at least one of a physicaldownlink control channel (PDCCH) carrying the DCI, a physical downlinkshared channel (PDSCH) carrying the MAC-CE, or the at least one SRSresource set. In some aspects, the time period may be a function of adecoding capability of the UE. In some aspects, the method may furtherinclude transmitting an indication of the decoding capability of the UEto the base station. In some aspects, the update may be applied to atransmission of the at least one SRS transmission after a time periodthat is based on whether the update is conveyed in the DCI or theMAC-CE.

A method of wireless communication operable at a base station isprovided. The method includes transmitting to a user equipment (UE), viaat least one of a downlink control information (DCI) or a medium accesscontrol (MAC) control element (MAC-CE), a configuration of one or moresounding reference signal (SRS) resource sets for SRS transmission. Themethod also includes transmitting, to the UE, an indication of an updateof one or more parameters, via at least one of the DCI or the MAC-CE,for at least one SRS resource set of the one or more SRS resource sets.The method further includes receiving one or more SRS transmissions fromthe UE in accordance with the update.

In some aspects, the one or more parameters may include a non-zero power(NZP) channel state information reference signal (NZP CSI-RS)identification (NZP CSI-RS ID) associated with the at least one SRSresource set. In some aspects, the at least one SRS resource set mayinclude a resource type of one of aperiodic (AP), semi-persistent (SP),or periodic (P) for a non-codebook physical uplink shared channel(PUSCH) transmission. In some aspects, the receiving the one or more SRStransmissions from the UE in accordance with the update may includereceiving the one or more SRS transmission from the UE in accordancewith the update at a time period after receiving one of the DCI or theMAC-CE. In some aspects, the time period may be a function of a framenumerology of at least one of a physical downlink control channel(PDCCH) carrying the DCI, a physical downlink shared channel (PDSCH)carrying the MAC-CE, or the at least one SRS resource set. In someaspects, the time period may be a function of a decoding capability ofthe UE. In some aspects, the method may further include receiving, fromthe UE, a signal indicating the decoding capability of the UE.

A user equipment (UE) in a wireless communication system is provided.The UE includes a wireless transceiver. The UE also includes a memory.The UE further includes a processor communicatively coupled to thewireless transceiver and the memory. The processor and the memory areconfigured to receive from a base station, via at least one of adownlink control information (DCI) or a medium access control (MAC)control element (MAC-CE), a configuration of one or more soundingreference signal (SRS) resource sets for SRS transmission. The processorand the memory are also configured to receive an indication of an updateof one or more parameters, via at least one of the DCI or the MAC-CE,for at least one SRS resource set of the one or more SRS resource sets.The processor and the memory are further configured to apply the updateto at least one SRS transmission.

A base station in a wireless communication system is provided. The basestation includes a wireless transceiver. The base station also includesa memory. The base station further includes a processor communicativelycoupled to the wireless transceiver and the memory. The processor andthe memory are configured to transmit to a user equipment (UE), via atleast one of a downlink control information (DCI) or a medium accesscontrol (MAC) control element (MAC-CE), a configuration of one or moresounding reference signal (SRS) resource sets for SRS transmission. Theprocessor and the memory are also configured to transmit, to the UE, anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets. The processor and the memory are furtherconfigured to receive one or more SRS transmissions from the UE inaccordance with the update.

A non-transitory, processor-readable storage medium of a user equipment(UE) having instructions stored thereon is provided. The instructions,when executed by a processing circuit, cause the processing circuit toreceive from a base station, via at least one of a downlink controlinformation (DCI) or a medium access control (MAC) control element(MAC-CE), a configuration of one or more sounding reference signal (SRS)resource sets for SRS transmission. The instructions, when executed bythe processing circuit, also cause the processing circuit to receive anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets. The instructions, when executed by theprocessing circuit, further cause the processing circuit to apply theupdate to at least one SRS transmission.

A non-transitory, processor-readable storage medium of a base stationhaving instructions stored thereon is provided. The instructions, whenexecuted by a processing circuit, cause the processing circuit totransmit to a user equipment (UE), via at least one of a downlinkcontrol information (DCI) or a medium access control (MAC) controlelement (MAC-CE), a configuration of one or more sounding referencesignal (SRS) resource sets for SRS transmission. The instructions, whenexecuted by the processing circuit, also cause the processing circuit totransmit, to the UE, an indication of an update of one or moreparameters, via at least one of the DCI or the MAC-CE, for at least oneSRS resource set of the one or more SRS resource sets. The instructions,when executed by the processing circuit, further cause the processingcircuit to receive one or more SRS transmissions from the UE inaccordance with the update.

A user equipment (UE) is provided. The UE includes a means for receivingfrom a base station, via at least one of a downlink control information(DCI) or a medium access control (MAC) control element (MAC-CE), aconfiguration of one or more sounding reference signal (SRS) resourcesets for SRS transmission. The UE also includes a means for receiving anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets. The UE further includes a means for applying theupdate to at least one SRS transmission.

A base station is provided. The base station includes a means fortransmitting to a user equipment (UE), via at least one of a downlinkcontrol information (DCI) or a medium access control (MAC) controlelement (MAC-CE), a configuration of one or more sounding referencesignal (SRS) resource sets for SRS transmission. The base station alsoincludes a means for transmitting, to the UE, an indication of an updateof one or more parameters, via at least one of the DCI or the MAC-CE,for at least one SRS resource set of the one or more SRS resource sets.The base station further includes a means for receiving one or more SRStransmissions from the UE in accordance with the update.

These and other aspects of the invention will become more fullyunderstood upon a review of the detailed description, which follows.Other aspects, features, and embodiments will become apparent to thoseof ordinary skill in the art, upon reviewing the following descriptionof specific, exemplary embodiments in conjunction with the accompanyingfigures. While features may be discussed relative to certain embodimentsand figures below, all embodiments can include one or more of theadvantageous features discussed herein. In other words, while one ormore embodiments may be discussed as having certain advantageousfeatures, one or more of such features may also be used in accordancewith the various embodiments discussed herein. In similar fashion, whileexemplary embodiments may be discussed below as device, system, ormethod embodiments it should be understood that such exemplaryembodiments can be implemented in various devices, systems, and methods.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic illustration of a wireless communication systemaccording to some aspects.

FIG. 2 is a conceptual illustration of an example of a radio accessnetwork according to some aspects.

FIG. 3 is a block diagram illustrating a wireless communication systemsupporting multiple-input multiple-output (MIMO) communication.

FIG. 4 is a diagram illustrating an example of communication between abase station and a user equipment (UE) using beamforming according tosome aspects.

FIG. 5 is a schematic illustration of an organization of wirelessresources in an air interface utilizing orthogonal frequency divisionalmultiplexing (OFDM) according to some embodiments.

FIG. 6 is a schematic illustration of an OFDM air interface utilizing ascalable numerology according to some aspects of the disclosure.

FIG. 7 is a diagram illustrating an example environment for signaling todynamically update the configuration of a sound reference signal (SRS)resource set according to some aspects.

FIG. 8 is a block diagram conceptually illustrating an example of ahardware implementation for a UE according to some aspects of thedisclosure.

FIG. 9 is a flow chart of a method for signaling to dynamically updatethe configuration of a SRS resource set according to some aspects.

FIG. 10 is another flow chart of a method for signaling to dynamicallyupdate the configuration of a SRS resource set according to someaspects.

FIG. 11 is a block diagram conceptually illustrating an example of ahardware implementation for a base station according to some aspects ofthe disclosure.

FIG. 12 is a flow chart of a method for signaling to dynamically updatethe configuration of a SRS resource set according to some aspects.

FIG. 13 is another flow chart of a method for signaling to dynamicallyupdate the configuration of a SRS resource set according to someaspects.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the appendeddrawings is intended as a description of various configurations and isnot intended to represent the only configurations in which the conceptsdescribed herein may be practiced. The detailed description includesspecific details for the purpose of providing a thorough understandingof various concepts. However, it will be apparent to those skilled inthe art that these concepts may be practiced without these specificdetails. In some instances, well known structures and components areshown in block diagram form in order to avoid obscuring such concepts.

Certain aspects of the present disclosure provide apparatus, methods,processing systems, and computer readable mediums for downlink controlinformation (DCI)-based or medium access control (MAC) control element(MAC-CE)-based dynamic updating of sounding reference signal (SRS)resource set content for reporting channel state information(CSI)-reference signal (RS) feedback. Various updates of SRS resourceset content may be configured and/or updated dynamically by a basestation (BS) using a radio access control (RRC) configuration. Forexample, for aperiodic CSI, a CSI-ResourceID field may be used toconfigured and/or dynamically update a UE with updated SRS resource setcontent using RRC signaling. The dynamically updated SRS resource setcontent may indicate, via an information element (IE), information suchas how to report CSI-RS measurement results (e.g., which beam to use orwhich resource set to use by indicating a resource set ID). Thedynamically updated SRS resource set content may also indicate the typeof CSI-RS to be transmitted (e.g., non-zero power (NZP) CSI-RS orinterference management (IM) CSI-RS). The dynamically updated SRSresource set content may indicate quasi-co location (QCL) information,which may indicate which beam is used for the transmission of theCSI-RS, allowing the UE to receive the CSI-RS more efficiently.

As described herein, in certain implementations, the dynamically updatedSRS resource set content may be activated using medium access control(MAC)-control element (CE). The dynamically updated SRS resource setcontent may introduce activation latency (e.g., 3 ms) for UE to applythe activation command Certain aspects of the present disclosure aredirected to DCI-based dynamically updated SRS resource set content. Forexample, dynamically updating SRS resource set content may be performedvia DCI. The dynamic updating of the SRS resource set content may beperformed using either a new DCI format or using an existing DCI format(e.g., format 0_1 or 0_2) by using reserved bits or configurable newfields. In certain aspects, an acknowledgment (ACK)/negative ACK (NAK)for receiving the DCI may be sent by the UE in uplink (UL) (e.g., viaphysical uplink control channel (PUCCH) or physical uplink sharedchannel (PUSCH)).

In certain aspects, the UE may report whether the UE supports DCI-baseddynamically updated SRS resource set content. In this case, thetransmission of the DCI dynamically updated SRS resource set content maybe in response to the UE's indication that the UE supports the DCI-baseddynamically updated SRS resource set content. In some cases, the BS mayindicate, to the UE, that DCI-based dynamically updated SRS resource setcontent is enabled, via RRC, MAC-CE, and/or DCI.

While aspects and embodiments are described in this application byillustration to some examples, those skilled in the art will understandthat additional implementations and use cases may come about in manydifferent arrangements and scenarios. Innovations described herein maybe implemented across many differing platform types, devices, systems,shapes, sizes, and packaging arrangements. For example, embodimentsand/or uses may come about via integrated chip embodiments and othernon-module-component based devices (e.g., end-user devices, vehicles,communication devices, computing devices, industrial equipment,retail/purchasing devices, medical devices, AI-enabled devices, etc.).While some examples may or may not be specifically directed to use casesor applications, a wide assortment of applicability of describedinnovations may occur. Implementations may range a spectrum fromchip-level or modular components to non-modular, non-chip-levelimplementations and further to aggregate, distributed, or OEM devices orsystems incorporating one or more aspects of the described innovations.In some practical settings, devices incorporating described aspects andfeatures may also necessarily include additional components and featuresfor implementation and practice of claimed and described embodiments.For example, transmission and reception of wireless signals necessarilyincludes a number of components for analog and digital purposes (e.g.,hardware components including antenna, RF-chains, power amplifiers,modulators, buffer, processor(s), interleaver, adders/summers, etc.). Itis intended that innovations described herein may be practiced in a widevariety of devices, chip-level components, systems, distributedarrangements, end-user devices, etc. of varying sizes, shapes andconstitution.

The various concepts presented throughout this disclosure may beimplemented across a broad variety of telecommunication systems, networkarchitectures, and communication standards. Referring now to FIG. 1, asan illustrative example without limitation, various aspects of thepresent disclosure are illustrated with reference to a wirelesscommunication system 100. The wireless communication system 100 includesthree interacting domains: a core network 102, a radio access network(RAN) 104, and a user equipment (UE) 106. By virtue of the wirelesscommunication system 100, the UE 106 may be enabled to carry out datacommunication with an external data network 110, such as (but notlimited to) the Internet.

The RAN 104 may implement any suitable wireless communication technologyor technologies to provide radio access to the UE 106. As one example,the RAN 104 may operate according to 3rd Generation Partnership Project(3GPP) New Radio (NR) specifications, often referred to as 5G. Asanother example, the RAN 104 may operate under a hybrid of 5G NR andEvolved Universal Terrestrial Radio Access Network (eUTRAN) standards,often referred to as Long-Term Evolution (LTE). The 3GPP refers to thishybrid RAN as a next-generation RAN, or NG-RAN. Of course, many otherexamples may be utilized within the scope of the present disclosure.

As illustrated, the RAN 104 includes a plurality of base stations 108(e.g., a RAN entity, RAN node, or the like). Broadly, a base station isa network element in a radio access network responsible for radiotransmission and reception in one or more cells to or from a UE. Indifferent technologies, standards, or contexts, a base station mayvariously be referred to by those skilled in the art as a basetransceiver station (BTS), a radio base station, a radio transceiver, atransceiver function, a basic service set (BSS), an extended service set(ESS), an access point (AP), a Node B (NB), an eNode B (eNB), a gNode B(gNB), a transmission and reception point (TRP), or some other suitableterminology. In some examples, a base station may include two or moreTRPs that may be collocated or non-collocated. Each TRP may communicateon the same or different carrier frequency within the same or differentfrequency band.

The radio access network 104 is further illustrated supporting wirelesscommunication for multiple mobile apparatuses. A mobile apparatus may bereferred to as user equipment (UE) in 3GPP standards, but may also bereferred to by those skilled in the art as a mobile station (MS), asubscriber station, a mobile unit, a subscriber unit, a wireless unit, aremote unit, a mobile device, a wireless device, a wirelesscommunications device, a remote device, a mobile subscriber station, anaccess terminal (AT), a mobile terminal, a wireless terminal, a remoteterminal, a handset, a terminal, a user agent, a mobile client, aclient, or some other suitable terminology. A UE may be an apparatusthat provides a user with access to network services.

Within the present document, a “mobile” apparatus need not necessarilyhave a capability to move and may be stationary. The term mobileapparatus or mobile device broadly refers to a diverse array of devicesand technologies. UEs may include a number of hardware structuralcomponents sized, shaped, and arranged to help in communication; suchcomponents can include antennas, antenna arrays, RF chains, amplifiers,one or more processors, etc. electrically coupled to each other. Forexample, some non-limiting examples of a mobile apparatus include amobile, a cellular (cell) phone, a smart phone, a session initiationprotocol (SIP) phone, a laptop, a personal computer (PC), a notebook, anetbook, a smartbook, a tablet, a personal digital assistant (PDA), anda broad array of embedded systems, e.g., corresponding to an “Internetof Things” (IoT). A mobile apparatus may additionally be an automotiveor other transportation vehicle, a remote sensor or actuator, a robot orrobotics device, a satellite radio, a global positioning system (GPS)device, an object tracking device, a drone, a multi-copter, aquad-copter, a remote control device, a consumer and/or wearable device,such as eyewear, a wearable camera, a virtual reality device, a smartwatch, a health or fitness tracker, a digital audio player (e.g., MP3player), a camera, a game console, etc. A mobile apparatus mayadditionally be a digital home or smart home device such as a homeaudio, video, and/or multimedia device, an appliance, a vending machine,intelligent lighting, a home security system, a smart meter, etc. Amobile apparatus may additionally be a smart energy device, a securitydevice, a solar panel or solar array, a municipal infrastructure devicecontrolling electric power (e.g., a smart grid), lighting, water, anindustrial automation and enterprise device, a logistics controller,agricultural equipment, etc. Still further, a mobile apparatus mayprovide for connected medicine or telemedicine support, e.g., healthcare at a distance. Telehealth devices may include telehealth monitoringdevices and telehealth administration devices, whose communication maybe given preferential treatment or prioritized access over other typesof information, e.g., in terms of prioritized access for transport ofcritical service data, and/or relevant QoS for transport of criticalservice data.

Wireless communication between a RAN 104 and a UE 106 may be describedas utilizing an air interface. Transmissions over the air interface froma base station (e.g., base station 108) to one or more UEs (e.g., UE106) may be referred to as downlink (DL) transmission. In accordancewith certain aspects of the present disclosure, the term downlink mayrefer to a point-to-multipoint transmission originating at a schedulingentity (described further below; e.g., base station 108). Another way todescribe this scheme may be to use the term broadcast channelmultiplexing. Transmissions from a UE (e.g., UE 106) to a base station(e.g., base station 108) may be referred to as uplink (UL)transmissions. In accordance with further aspects of the presentdisclosure, the term uplink may refer to a point-to-point transmissionoriginating at a scheduled entity (described further below; e.g., UE106).

In some examples, access to the air interface may be scheduled, whereina scheduling entity (e.g., a base station 108) allocates resources forcommunication among some or all devices and equipment within its servicearea or cell. Within the present disclosure, as discussed further below,the scheduling entity may be responsible for scheduling, assigning,reconfiguring, and releasing resources for one or more scheduledentities. That is, for scheduled communication, UEs 106, which may bescheduled entities, may utilize resources allocated by the schedulingentity 108.

As illustrated in FIG. 1, a scheduling entity 108 may broadcast downlinktraffic 112 to one or more scheduled entities 106. Broadly, thescheduling entity 108 is a node or device responsible for schedulingtraffic in a wireless communication network, including the downlinktraffic 112 and, in some examples, uplink traffic 116 from one or morescheduled entities 106 to the scheduling entity 108. On the other hand,the scheduled entity 106 is a node or device that receives downlinkcontrol information 114, including but not limited to schedulinginformation (e.g., a grant), synchronization or timing information, orother control information from another entity in the wirelesscommunication network such as the scheduling entity 108.

In addition, the uplink and/or downlink control information and/ortraffic information may be time-divided into frames, subframes, slots,and/or symbols. As used herein, a symbol may refer to a unit of timethat, in an orthogonal frequency division multiplexed (OFDM) waveform,carries one resource element (RE) per sub-carrier. A slot may carry 7 or14 OFDM symbols. A subframe may refer to a duration of 1 ms. Multiplesubframes or slots may be grouped together to form a single frame orradio frame. Of course, these definitions are not required, and anysuitable scheme for organizing waveforms may be utilized, and varioustime divisions of the waveform may have any suitable duration.

In general, base stations 108 may include a backhaul interface forcommunication with a backhaul portion 120 of the wireless communicationsystem. The backhaul 120 may provide a link between a base station 108and the core network 102. Further, in some examples, a backhaul networkmay provide interconnection between the respective base stations 108.Various types of backhaul interfaces may be employed, such as a directphysical connection, a virtual network, or the like using any suitabletransport network.

The core network 102 may be a part of the wireless communication system100, and may be independent of the radio access technology used in theRAN 104. In some examples, the core network 102 may be configuredaccording to 5G standards (e.g., 5GC). In other examples, the corenetwork 102 may be configured according to a 4G evolved packet core(EPC), or any other suitable standard or configuration.

Referring now to FIG. 2, by way of example and without limitation, aschematic illustration of a RAN 200 is provided. In some examples, theRAN 200 may be the same as the RAN 104 described above and illustratedin FIG. 1. The geographic area covered by the RAN 200 may be dividedinto cellular regions (cells) that can be uniquely identified by a userequipment (UE) based on an identification broadcasted from one accesspoint or base station. FIG. 2 illustrates macrocells 202, 204, and 206,and a small cell 208, each of which may include one or more sectors (notshown). A sector is a sub-area of a cell. All sectors within one cellare served by the same base station. A radio link within a sector can beidentified by a single logical identification belonging to that sector.In a cell that is divided into sectors, the multiple sectors within acell can be formed by groups of antennas with each antenna responsiblefor communication with UEs in a portion of the cell.

Various base station arrangements can be utilized. For example, in FIG.2, two base stations 210 and 212 are shown in cells 202 and 204; and athird base station 214 is shown controlling a remote radio head (RRH)216 in cell 206. That is, a base station can have an integrated antennaor can be connected to an antenna or RRH by feeder cables. In theillustrated example, the cells 202, 204, and 206 may be referred to asmacrocells, as the base stations 210, 212, and 214 support cells havinga large size. Further, a base station 218 is shown in the small cell 208(e.g., a microcell, picocell, femtocell, home base station, home Node B,home eNode B, etc.) which may overlap with one or more macrocells. Inthis example, the cell 208 may be referred to as a small cell, as thebase station 218 supports a cell having a relatively small size. Cellsizing can be done according to system design as well as componentconstraints.

It is to be understood that the radio access network 200 may include anynumber of wireless base stations and cells. Further, a relay node may bedeployed to extend the size or coverage area of a given cell. The basestations 210, 212, 214, 218 provide wireless access points to a corenetwork for any number of mobile apparatuses. In some examples, the basestations 210, 212, 214, and/or 218 may be the same as the basestation/scheduling entity 108 described above and illustrated in FIG. 1.

Within the RAN 200, the cells may include UEs that may be incommunication with one or more sectors of each cell. Further, each basestation 210, 212, 214, and 218 may be configured to provide an accesspoint to a core network (e.g., as illustrated in FIG. 1 and/or 2) forall the UEs in the respective cells. For example, UEs 222 and 224 may bein communication with base station 210; UEs 226 and 228 may be incommunication with base station 412; UEs 230 and 232 may be incommunication with base station 214 by way of RRH 216; and UE 234 may bein communication with base station 218. In some examples, the UEs 222,224, 226, 228, 230, 232, 234, 238, 240, and/or 242 may be the same asthe UE/scheduled entity 106 described above and illustrated in FIG. 1.

In some examples, an unmanned aerial vehicle (UAV) 220, which may be adrone or quadcopter, can be a mobile network node and may be configuredto function as a UE. For example, the UAV 220 may operate within cell202 by communicating with base station 210.

Base stations 210, 212, 214, 218 may operate as scheduling entities,scheduling resources for communication among the UEs within theirservice areas or cells 202, 204, 206, 208, respectively. However, basestations are not the only entities that may function as a schedulingentity. That is, in some examples, a UE may function as a schedulingentity, scheduling resources for one or more scheduled entities (e.g.,one or more other UEs). For example, two or more UEs (e.g., UEs 238,240, and 242) may communicate with each other using peer to peer (P2P)or sidelink signals 237 without relaying that communication through abase station. In some examples, the UEs 238, 240, and 242 may eachfunction as a scheduling entity or transmitting sidelink device and/or ascheduled entity or a receiving sidelink device to schedule resourcesand communicate sidelink signals 237 therebetween without relying onscheduling or control information from a base station. In otherexamples, two or more UEs (e.g., UEs 226 and 228) within the coveragearea of a base station (e.g., base station 212) may also communicatesidelink signals 227 over a direct link (sidelink) without conveyingthat communication through the base station 246. In this example, thebase station 212 may allocate resources to the UEs 226 and 228 for thesidelink communication. In either case, such sidelink signaling 227 and237 may be implemented in a P2P network, a device-to-device (D2D)network, vehicle-to-vehicle (V2V) network, a vehicle-to-everything(V2X), a mesh network, or other suitable direct link network.

In the RAN 200, the ability for a UE to communicate while moving,independent of its location, is referred to as mobility. The variousphysical channels between the UE and the radio access network aregenerally set up, maintained, and released under the control of an AMF.

A RAN 200 may utilize DL-based mobility or UL-based mobility to enablemobility and handovers (e.g., the transfer of a UE's connection from oneradio channel to another). In a network configured for DL-basedmobility, during a call with a scheduling entity, or at any other time,a UE may monitor various parameters of the signal from its serving cellas well as various parameters of neighboring cells. Depending on thequality of these parameters, the UE may maintain communication with oneor more of the neighboring cells. During this time, if the UE moves fromone cell to another, or if signal quality from a neighboring cellexceeds that from the serving cell for a given amount of time, the UEmay undertake a handoff or handover from the serving cell to theneighboring (target) cell. For example, UE 224 (illustrated as avehicle, although any suitable form of UE may be used) may move from thegeographic area corresponding to its serving cell 202 to the geographicarea corresponding to a neighbor cell 206. When the signal strength orquality from the neighbor cell 206 exceeds that of its serving cell 202for a given amount of time, the UE 224 may transmit a reporting messageto its serving base station 210 indicating this condition. In response,the UE 224 may receive a handover command, and the UE may undergo ahandover to the cell 206.

In a network configured for UL-based mobility, UL reference signals fromeach UE may be utilized by the network to select a serving cell for eachUE. In some examples, the base stations 210, 212, and 214/216 maybroadcast unified synchronization signals (e.g., unified PrimarySynchronization Signals (PSSs), unified Secondary SynchronizationSignals (SSSs) and unified Physical Broadcast Channels (PBCH)). The UEs222, 224, 226, 228, 230, and 232 may receive the unified synchronizationsignals, derive the carrier frequency and slot timing from thesynchronization signals, and in response to deriving timing, transmit anuplink pilot or reference signal. The uplink pilot signal transmitted bya UE (e.g., UE 224) may be concurrently received by two or more cells(e.g., base stations 210 and 214/216) within the radio access network200. Each of the cells may measure a strength of the pilot signal, andthe radio access network (e.g., one or more of the base stations 210 and214/216 and/or a central node within the core network) may determine aserving cell for the UE 224. As the UE 224 moves through the radioaccess network 200, the network may continue to monitor the uplink pilotsignal transmitted by the UE 224. When the signal strength or quality ofthe pilot signal measured by a neighboring cell exceeds that of thesignal strength or quality measured by the serving cell, the network 200may handover the UE 224 from the serving cell to the neighboring cell,with or without informing the UE 224.

Although the synchronization signal transmitted by the base stations210, 212, and 214/216 may be unified, the synchronization signal may notidentify a particular cell, but rather may identify a zone of multiplecells operating on the same frequency and/or with the same timing. Theuse of zones in 5G networks or other next generation communicationnetworks enables the uplink-based mobility framework and improves theefficiency of both the UE and the network, since the number of mobilitymessages that need to be exchanged between the UE and the network may bereduced.

In various implementations, the air interface in the radio accessnetwork 200 may utilize licensed spectrum, unlicensed spectrum, orshared spectrum. Licensed spectrum provides for exclusive use of aportion of the spectrum, generally by virtue of a mobile networkoperator purchasing a license from a government regulatory body.Unlicensed spectrum provides for shared use of a portion of the spectrumwithout need for a government-granted license. While compliance withsome technical rules is generally still required to access unlicensedspectrum, generally, any operator or device may gain access. Sharedspectrum may fall between licensed and unlicensed spectrum, whereintechnical rules or limitations may be required to access the spectrum,but the spectrum may still be shared by multiple operators and/ormultiple RATs. For example, the holder of a license for a portion oflicensed spectrum may provide licensed shared access (LSA) to share thatspectrum with other parties, e.g., with suitable licensee-determinedconditions to gain access.

The air interface in the radio access network 200 may utilize one ormore multiplexing and multiple access algorithms to enable simultaneouscommunication of the various devices. For example, 5G NR specificationsprovide multiple access for UL transmissions from UEs 222 and 224 tobase station 210, and for multiplexing for DL transmissions from basestation 210 to one or more UEs 222 and 224, utilizing orthogonalfrequency division multiplexing (OFDM) with a cyclic prefix (CP). Inaddition, for UL transmissions, 5G NR specifications provide support fordiscrete Fourier transform-spread-OFDM (DFT-s-OFDM) with a CP (alsoreferred to as single-carrier FDMA (SC-FDMA)). However, within the scopeof the present disclosure, multiplexing and multiple access are notlimited to the above schemes, and may be provided utilizing timedivision multiple access (TDMA), code division multiple access (CDMA),frequency division multiple access (FDMA), sparse code multiple access(SCMA), resource spread multiple access (RSMA), or other suitablemultiple access schemes. Further, multiplexing DL transmissions from thebase station 210 to UEs 222 and 224 may be provided utilizing timedivision multiplexing (TDM), code division multiplexing (CDM), frequencydivision multiplexing (FDM), orthogonal frequency division multiplexing(OFDM), sparse code multiplexing (SCM), or other suitable multiplexingschemes.

The air interface in the radio access network 200 may further utilizeone or more duplexing algorithms. Duplex refers to a point-to-pointcommunication link where both endpoints can communicate with one anotherin both directions. Full-duplex means both endpoints can simultaneouslycommunicate with one another. Half-duplex means only one endpoint cansend information to the other at a time. Half-duplex emulation isfrequently implemented for wireless links utilizing time division duplex(TDD). In TDD, transmissions in different directions on a given channelare separated from one another using time division multiplexing. Thatis, at some times the channel is dedicated for transmissions in onedirection, while at other times the channel is dedicated fortransmissions in the other direction, where the direction may changevery rapidly, e.g., several times per slot. In a wireless link, afull-duplex channel generally relies on physical isolation of atransmitter and receiver, and suitable interference cancellationtechnologies. Full-duplex emulation is frequently implemented forwireless links by utilizing frequency division duplex (FDD) or spatialdivision duplex (SDD). In FDD, transmissions in different directions mayoperate at different carrier frequencies (e.g., within paired spectrum).In SDD, transmissions in different directions on a given channel areseparated from one another using spatial division multiplexing (SDM). Inother examples, full-duplex communication may be implemented withinunpaired spectrum (e.g., within a single carrier bandwidth), wheretransmissions in different directions occur within different sub-bandsof the carrier bandwidth. This type of full-duplex communication may bereferred to herein as sub-band full duplex (SBFD), also known asflexible duplex.

In some aspects of the disclosure, the scheduling entity and/orscheduled entity may be configured for beamforming and/or multiple-inputmultiple-output (MIMO) technology. FIG. 3 illustrates an example of awireless communication system 300 supporting MIMO. In a MIMO system, atransmitter 302 includes multiple transmit antennas 304 (e.g., Ntransmit antennas) and a receiver 306 includes multiple receive antennas308 (e.g., M receive antennas). Thus, there are N×M signal paths 310from the transmit antennas 304 to the receive antennas 308. Each of thetransmitter 302 and the receiver 306 may be implemented, for example,within a scheduling entity 108, a scheduled entity 106, or any othersuitable wireless communication device.

The use of such multiple antenna technology enables the wirelesscommunication system to exploit the spatial domain to support spatialmultiplexing, beamforming, and transmit diversity. Spatial multiplexingmay be used to transmit different streams of data, also referred to aslayers, simultaneously on the same time-frequency resource. The datastreams may be transmitted to a single UE to increase the data rate orto multiple UEs to increase the overall system capacity, the latterbeing referred to as multi-user MIMO (MU-MIMO). This is achieved byspatially precoding each data stream (e.g., multiplying the data streamswith different weighting and phase shifting) and then transmitting eachspatially precoded stream through multiple transmit antennas on thedownlink. The spatially precoded data streams arrive at the UE(s) withdifferent spatial signatures, which enables each of the UE(s) to recoverthe one or more data streams destined for that UE. On the uplink, eachUE transmits a spatially precoded data stream, which enables the basestation to identify the source of each spatially precoded data stream.

The number of data streams or layers corresponds to the rank of thetransmission. In general, the rank of the MIMO system 300 is limited bythe number of transmit or receive antennas 304 or 308, whichever islower. In addition, the channel conditions at the UE, as well as otherconsiderations, such as the available resources at the base station, mayalso affect the transmission rank. For example, the rank (and therefore,the number of data streams) assigned to a particular UE on the downlinkmay be determined based on the rank indicator (RI) transmitted from theUE to the base station. The RI may be determined based on the antennaconfiguration (e.g., the number of transmit and receive antennas) and ameasured signal-to-interference-and-noise ratio (SINR) on each of thereceive antennas. The RI may indicate, for example, the number of layersthat may be supported under the current channel conditions. The basestation may use the RI, along with resource information (e.g., theavailable resources and amount of data to be scheduled for the UE), toassign a transmission rank to the UE.

In Time Division Duplex (TDD) systems, the UL and DL are reciprocal, inthat each uses different time slots of the same frequency bandwidth.Therefore, in TDD systems, the base station may assign the rank for DLMIMO transmissions based on UL SINR measurements (e.g., based on aSounding Reference Signal (SRS) transmitted from the UE or other pilotsignal). Based on the assigned rank, the base station may then transmitthe CSI-RS with separate C-RS sequences for each layer to provide formulti-layer channel estimation. From the CSI-RS, the UE may measure thechannel quality across layers and resource blocks and feedback the CQIand RI values to the base station for use in updating the rank andassigning REs for future downlink transmissions.

In the simplest case, as shown in FIG. 3, a rank-2 spatial multiplexingtransmission on a 2×2 MIMO antenna configuration will transmit one datastream from each transmit antenna 304. Each data stream reaches eachreceive antenna 308 along a different signal path 310. The receiver 306may then reconstruct the data streams using the received signals fromeach receive antenna 308.

Beamforming is a signal processing technique that may be used at thetransmitter 302 or receiver 306 to shape or steer an antenna beam (e.g.,a transmit beam or receive beam) along a spatial path between thetransmitter 302 and the receiver 306. Beamforming may be achieved bycombining the signals communicated via antennas 304 or 308 (e.g.,antenna elements of an antenna array module) such that some of thesignals experience constructive interference while others experiencedestructive interference. To create the desired constructive/destructiveinterference, the transmitter 302 or receiver 306 may apply amplitudeand/or phase offsets to signals transmitted or received from each of theantennas 304 or 308 associated with the transmitter 302 or receiver 306.A beam may be formed by, but not limited to, an antenna, an antennaport, an antenna element, a group of antennas, a group of antenna portsor a group of antenna elements. The beam may be alternatively made witha certain reference signal resource. The beam may be equivalent to aspatial domain filtering by which an electromagnetic (EM) radiation istransmitted.

In 5G New Radio (NR) systems, particularly for mmWave systems,beamformed signals may be utilized for most downlink channels, includingthe physical downlink control channel (PDCCH) and physical downlinkshared channel (PDSCH). In addition, broadcast information, such as theSSB, CSI-RS, slot format indicator (SFI), and paging information, may betransmitted in a beam-sweeping manner to enable all scheduled entities(UEs) in the coverage area of a transmission and reception point (TRP)(e.g., a gNB) to receive the broadcast information. In addition, for UEsconfigured with beamforming antenna arrays, beamformed signals may alsobe utilized for uplink channels, including the physical uplink controlchannel (PUCCH) and physical uplink shared channel (PUSCH).

FIG. 4 is a diagram illustrating communication between a base station404 and a UE 402 using beamformed signals according to some aspects. Thebase station 404 may be any of the base stations (e.g., gNBs) orscheduling entities illustrated in FIGS. 1-3, and the UE 402 may be anyof the UEs or scheduled entities illustrated in FIGS. 1-3.

The base station 404 may generally be capable of communicating with theUE 402 using one or more transmit beams, and the UE 402 may further becapable of communicating with the base station 404 using one or morereceive beams. As used herein, the term transmit beam refers to a beamon the base station 404 that may be utilized for downlink or uplinkcommunication with the UE 402. In addition, the term receive beam refersto a beam on the UE 402 that may be utilized for downlink or uplinkcommunication with the base station 404.

In the example shown in FIG. 4, the base station 404 is configured togenerate a plurality of transmit beams 406 a, 406 b, 406 c, 406 d, 406e, 406 f, 406 g, and 406 h (406 a-406 h), each associated with adifferent spatial direction. In addition, the UE 402 is configured togenerate a plurality of receive beams 408 a, 408 b, 408 c, 408 d, and408 e (408 a-408 e), each associated with a different spatial direction.It should be noted that while some beams are illustrated as adjacent toone another, such an arrangement may be different in different aspects.For example, transmit beams 406 a-406 h transmitted during a same symbolmay not be adjacent to one another. In some examples, the base station404 and UE 402 may each transmit more or less beams distributed in alldirections (e.g., 360 degrees) and in three-dimensions. In addition, thetransmit beams 406 a-406 h may include beams of varying beam width. Forexample, the base station 404 may transmit certain signals (e.g.,synchronization signal blocks (SSBs)) on wider beams and other signals(e.g., CSI-RSs) on narrower beams.

The base station 404 and UE 402 may select one or more transmit beams406 a-406 h on the base station 404 and one or more receive beams 408a-408 e on the UE 402 for communication of uplink and downlink signalstherebetween using a beam management procedure. In one example, duringinitial cell acquisition, the UE 402 may perform a P1 beam managementprocedure to scan the plurality of transmit beams 406 a-406 h on theplurality of receive beams 408 a-408 e to select a beam pair link (e.g.,one of the transmit beams 406 a-406 h and one of the receive beams 408a-408 e) for a physical random access channel (PRACH) procedure forinitial access to the cell. For example, periodic SSB beam sweeping maybe implemented on the base station 404 at certain intervals (e.g., basedon the SSB periodicity). Thus, the base station 404 may be configured tosweep or transmit an SSB on each of a plurality of wider transmit beams406 a-406 h during the beam sweeping interval. The UE may measure thereference signal received power (RSRP) of each of the SSB transmit beamson each of the receive beams of the UE and select the transmit andreceive beams based on the measured RSRP. In an example, the selectedreceive beam may be the receive beam on which the highest RSRP ismeasured and the selected transmit beam may have the highest RSRP asmeasured on the selected receive beam.

After completing the PRACH procedure, the base station 404 and UE 402may perform a P2 beam management procedure for beam refinement at thebase station 404. For example, the base station 404 may be configured tosweep or transmit a CSI-RS on each of a plurality of narrower transmitbeams 406 a-406 h. Each of the narrower CSI-RS beams may be a sub-beamof the selected SSB transmit beam (e.g., within the spatial direction ofthe SSB transmit beam). Transmission of the CSI-RS transmit beams mayoccur periodically (e.g., as configured via radio resource control (RRC)signaling by the gNB), semi-persistently (e.g., as configured via RRCsignaling and activated/deactivated via medium access control—controlelement (MAC-CE) signaling by the gNB), or aperiodically (e.g., astriggered by the gNB via downlink control information (DCI)). The UE 402is configured to scan the plurality of CSI-RS transmit beams 406 a-406 hon the plurality of receive beams 408 a-408 e. The UE 402 then performsbeam measurements (e.g., RSRP, SINR, etc.) of the received CSI-RSs oneach of the receive beams 408 a-408 e to determine the respective beamquality of each of the CSI-RS transmit beams 406 a-406 h as measured oneach of the receive beams 408 a-408 e.

The UE 402 can then generate and transmit a Layer 1 (L1) measurementreport, including the respective beam index (e.g., CSI-RS resourceindicator (CRI)) and beam measurement (e.g., RSRP or SINR) of one ormore of the CSI-RS transmit beams 406 a-406 h on one or more of thereceive beams 408 a-408 e to the base station 404. The base station 404may then select one or more CSI-RS transmit beams on which tocommunicate downlink and/or uplink control and/or data with the UE 402.In some examples, the selected CSI-RS transmit beam(s) have the highestRSRP from the L1 measurement report. Transmission of the L1 measurementreport may occur periodically (e.g., as configured via RRC signaling bythe gNB), semi-persistently (e.g., as configured via RRC signaling andactivated/deactivated via MAC-CE signaling by the gNB), or aperiodically(e.g., as triggered by the gNB via DCI).

The UE 402 may further select a corresponding receive beam on the UE 402for each selected serving CSI-RS transmit beam to form a respective beampair link (BPL) for each selected serving CSI-RS transmit beam. Forexample, the UE 402 can utilize the beam measurements obtained duringthe P2 procedure or perform a P3 beam management procedure to obtain newbeam measurements for the selected CSI-RS transmit beams to select thecorresponding receive beam for each selected transmit beam. In someexamples, the selected receive beam to pair with a particular CSI-RStransmit beam may be the receive beam on which the highest RSRP for theparticular CSI-RS transmit beam is measured.

In some examples, in addition to performing CSI-RS beam measurements,the base station 404 may configure the UE 402 to perform SSB beammeasurements and provide an L1 measurement report containing beammeasurements of SSB transmit beams 406 a-406 h. For example, the basestation 404 may configure the UE 402 to perform SSB beam measurementsand/or CSI-RS beam measurements for beam failure detection (BRD), beamfailure recovery (BFR), cell reselection, beam tracking (e.g., for amobile UE 402 and/or base station 404), or other beam optimizationpurpose.

In addition, when the channel is reciprocal, the transmit and receivebeams may be selected using an uplink beam management scheme. In anexample, the UE 402 may be configured to sweep or transmit on each of aplurality of receive beams 408 a-408 e. For example, the UE 402 maytransmit an SRS on each beam in the different beam directions. Inaddition, the base station 404 may be configured to receive the uplinkbeam reference signals on a plurality of transmit beams 406 a-406 h. Thebase station 404 then performs beam measurements (e.g., RSRP, SINR,etc.) of the beam reference signals on each of the transmit beams 406a-406 h to determine the respective beam quality of each of the receivebeams 408 a-408 e as measured on each of the transmit beams 406 a-406 h.

The base station 404 may then select one or more transmit beams on whichto communicate downlink and/or uplink control and/or data with the UE402. In some examples, the selected transmit beam(s) have the highestRSRP. The UE 402 may then select a corresponding receive beam for eachselected serving transmit beam to form a respective beam pair link (BPL)for each selected serving transmit beam, using, for example, a P3 beammanagement procedure, as described above.

In one example, a single CSI-RS transmit beam (e.g., beam 406 d) on thebase station 404 and a single receive beam (e.g., beam 408 c) on the UEmay form a single BPL used for communication between the base station404 and the UE 402. In another example, multiple CSI-RS transmit beams(e.g., beams 406 c, 406 d, and 406 e) on the base station 404 and asingle receive beam (e.g., beam 408 c) on the UE 402 may form respectiveBPLs used for communication between the base station 404 and the UE 402.In another example, multiple CSI-RS transmit beams (e.g., beams 406 c,406 d, and 406 e) on the base station 404 and multiple receive beams(e.g., beams 408 c and 408 d) on the UE 402 may form multiple BPLs usedfor communication between the base station 404 and the UE 402. In thisexample, a first BPL may include transmit beam 406 c and receive beam408 c, a second BPL may include transmit beam 408 d and receive beam 408c, and a third BPL may include transmit beam 408 e and receive beam 408d.

Various aspects of the present disclosure will be described withreference to an OFDM waveform, schematically illustrated in FIG. 5. Itshould be understood by those of ordinary skill in the art that thevarious aspects of the present disclosure may be applied to an SC-FDMAwaveform in substantially the same way as described herein below. Thatis, while some examples of the present disclosure may focus on an OFDMlink for clarity, it should be understood that the same principles maybe applied as well to SC-FDMA waveforms.

Referring now to FIG. 5, an expanded view of an exemplary DL subframe502 is illustrated, showing an OFDM resource grid. However, as thoseskilled in the art will readily appreciate, the PHY transmissionstructure for any particular application may vary from the exampledescribed here, depending on any number of factors. Here, time is in thehorizontal direction with units of OFDM symbols; and frequency is in thevertical direction with units of subcarriers.

The resource grid 504 may be used to schematically representtime—frequency resources for a given antenna port. That is, in amultiple-input-multiple-output (MIMO) implementation with multipleantenna ports available, a corresponding multiple number of resourcegrids 504 may be available for communication. The resource grid 504 isdivided into multiple resource elements (REs) 506. An RE, which is 1subcarrier×1 symbol, is the smallest discrete part of the time—frequencygrid, and contains a single complex value representing data from aphysical channel or signal. Depending on the modulation utilized in aparticular implementation, each RE may represent one or more bits ofinformation. In some examples, a block of REs may be referred to as aphysical resource block (PRB) or a resource block (RB) 508, whichcontains any suitable number of consecutive subcarriers in the frequencydomain. In one example, an RB may include 12 subcarriers, a numberindependent of the numerology used. In some examples, depending on thenumerology, an RB may include any suitable number of consecutive OFDMsymbols in the time domain Within the present disclosure, it is assumedthat a single RB such as the RB 508 entirely corresponds to a singledirection of communication (either transmission or reception for a givendevice).

Scheduling of UEs (e.g., scheduled entities) for downlink or uplinktransmissions typically involves scheduling one or more resourceelements 506 within one or more sub-bands. Thus, a UE generally utilizesonly a subset of the resource grid 504. In some examples, an RB may bethe smallest unit of resources that can be allocated to a UE. Thus, themore RBs scheduled for a UE, and the higher the modulation scheme chosenfor the air interface, the higher the data rate for the UE.

In this illustration, the RB 508 is shown as occupying less than theentire bandwidth of the subframe 502, with some subcarriers illustratedabove and below the RB 508. In a given implementation, the subframe 502may have a bandwidth corresponding to any number of one or more RBs 508.Further, in this illustration, the RB 508 is shown as occupying lessthan the entire duration of the subframe 502, although this is merelyone possible example.

Each 1 ms subframe 502 may consist of one or multiple adjacent slots. Inthe example shown in FIG. 5, one subframe 502 includes four slots 510,as an illustrative example. In some examples, a slot may be definedaccording to a specified number of OFDM symbols with a given cyclicprefix (CP) length. For example, a slot may include 7 or 14 OFDM symbolswith a nominal CP. Additional examples may include mini-slots, sometimesreferred to as shortened transmission time intervals (TTIs), having ashorter duration (e.g., one to three OFDM symbols). These mini-slots orshortened transmission time intervals (TTIs) may in some cases betransmitted occupying resources scheduled for ongoing slot transmissionsfor the same or for different UEs. Any number of resource blocks may beutilized within a subframe or slot.

An expanded view of one of the slots 510 illustrates the slot 510including a control region 512 and a data region 514. In general, thecontrol region 512 may carry control channels, and the data region 514may carry data channels. Of course, a slot may contain all DL, all UL,or at least one DL portion and at least one UL portion. The structureillustrated in FIG. 5 is merely exemplary in nature, and different slotstructures may be utilized, and may include one or more of each of thecontrol region(s) and data region(s).

Although not illustrated in FIG. 5, the various REs 506 within a RB 508may be scheduled to carry one or more physical channels, includingcontrol channels, shared channels, data channels, etc. Other REs 506within the RB 508 may also carry pilots or reference signals. Thesepilots or reference signals may provide for a receiving device toperform channel estimation of the corresponding channel, which mayenable coherent demodulation/detection of the control and/or datachannels within the RB 508.

In some examples, the slot 510 may be utilized for broadcast or unicastcommunication. For example, a broadcast, multicast, or groupcastcommunication may refer to a point-to-multipoint transmission by onedevice (e.g., a base station, UE, or other similar device) to otherdevices. Here, a broadcast communication is delivered to all devices,whereas a multicast communication is delivered to multiple intendedrecipient devices. A unicast communication may refer to a point-to-pointtransmission by a one device to a single other device.

In an example of cellular communication over a cellular carrier via a Uuinterface, for a DL transmission, the scheduling entity (e.g., a basestation) may allocate one or more REs 506 (e.g., within the controlregion 512) to carry DL control information including one or more DLcontrol channels, such as a physical downlink control channel (PDCCH),to one or more scheduled entities (e.g., UEs). The PDCCH carriesdownlink control information (DCI) including but not limited to powercontrol commands (e.g., one or more open loop power control parametersand/or one or more closed loop power control parameters), schedulinginformation, a grant, and/or an assignment of REs for DL and ULtransmissions. The PDCCH may further carry HARQ feedback transmissionssuch as an acknowledgment (ACK) or negative acknowledgment (NACK). HARQis a technique well-known to those of ordinary skill in the art, whereinthe integrity of packet transmissions may be checked at the receivingside for accuracy, e.g., utilizing any suitable integrity checkingmechanism, such as a checksum or a cyclic redundancy check (CRC). If theintegrity of the transmission is confirmed, an ACK may be transmitted,whereas if not confirmed, a NACK may be transmitted. In response to aNACK, the transmitting device may send a HARQ retransmission, which mayimplement chase combining, incremental redundancy, etc.

The base station may further allocate one or more REs 506 (e.g., in thecontrol region 512 or the data region 514) to carry other DL signals,such as a demodulation reference signal (DMRS); a phase-trackingreference signal (PT-RS); a channel state information (CSI) referencesignal (CSI-RS); and a synchronization signal block (SSB). SSBs may bebroadcast at regular intervals based on a periodicity (e.g., 5, 10, 20,40, 80, or 140 ms). An SSB includes a primary synchronization signal(PSS), a secondary synchronization signal (SSS), and a physicalbroadcast control channel (PBCH). A UE may utilize the PSS and SSS toachieve radio frame, subframe, slot, and symbol synchronization in thetime domain, identify the center of the channel (system) bandwidth inthe frequency domain, and identify the physical cell identity (PCI) ofthe cell.

The PBCH in the SSB may further include a master information block (MIB)that includes various system information, along with parameters fordecoding a system information block (SIB). The SIB may be, for example,a SystemInformationType 1 (SIB1) that may include various additionalsystem information. Examples of system information transmitted in theMIB may include, but are not limited to, a subcarrier spacing, systemframe number, a configuration of a PDCCH control resource set (CORESET)(e.g., PDCCH CORESET0), and a search space for SIB1. Examples ofadditional system information transmitted in the SIB1 may include, butare not limited to, a random access search space, downlink configurationinformation, and uplink configuration information. The MIB and SIB1together provide the minimum system information (SI) for initial access.

In an UL transmission, the scheduled entity (e.g., UE) may utilize oneor more REs 506 to carry UL control information (UCI) including one ormore UL control channels, such as a physical uplink control channel(PUCCH), to the scheduling entity. UCI may include a variety of packettypes and categories, including pilots, reference signals, andinformation configured to enable or assist in decoding uplink datatransmissions. Examples of uplink reference signals may include asounding reference signal (SRS) and an uplink DMRS. In some examples,the UCI may include a scheduling request (SR), e.g., request for thescheduling entity to schedule uplink transmissions. Here, in response tothe SR transmitted on the UCI, the scheduling entity may transmitdownlink control information (DCI) that may schedule resources foruplink packet transmissions. UCI may also include HARQ feedback, channelstate feedback (CSF), such as a CSI report, or any other suitable UCI.

In addition to control information, one or more REs 506 (e.g., withinthe data region 514) may be allocated for data traffic. Such datatraffic may be carried on one or more traffic channels, such as, for aDL transmission, a physical downlink shared channel (PDSCH); or for anUL transmission, a physical uplink shared channel (PUSCH). In someexamples, one or more REs 506 within the data region 514 may beconfigured to carry other signals, such as one or more SIBs and DMRSs.

In an example of sidelink communication over a sidelink carrier via aproximity service (ProSe) PC5 interface, the control region 512 of theslot 510 may include a physical sidelink control channel (PSCCH)including sidelink control information (SCI) transmitted by aninitiating (transmitting) sidelink device (e.g., V2X or other sidelinkdevice) towards a set of one or more other receiving sidelink devices.The data region 514 of the slot 510 may include a physical sidelinkshared channel (PSSCH) including sidelink data traffic transmitted bythe initiating (transmitting) sidelink device within resources reservedover the sidelink carrier by the transmitting sidelink device via theSCI. Other information may further be transmitted over various REs 506within slot 510. For example, HARQ feedback information may betransmitted in a physical sidelink feedback channel (PSFCH) within theslot 510 from the receiving sidelink device to the transmitting sidelinkdevice. In addition, one or more reference signals, such as a sidelinkSSB and/or a sidelink CSI-RS, may be transmitted within the slot 510.

These physical channels described above are generally multiplexed andmapped to transport channels for handling at the medium access control(MAC) layer. Transport channels carry blocks of information calledtransport blocks (TB). The transport block size (TBS), which maycorrespond to a number of bits of information, may be a controlledparameter, based on the modulation and coding scheme (MCS) and thenumber of RBs in a given transmission.

The channels or carriers described herein are not necessarily all of thechannels or carriers that may be utilized between a scheduling entityand scheduled entities, and those of ordinary skill in the art willrecognize that other channels or carriers may be utilized in addition tothose illustrated, such as other traffic, control, and feedbackchannels.

In OFDM, to maintain orthogonality of the subcarriers or tones, thesubcarrier spacing may be equal to the inverse of the symbol period. Anumerology of an OFDM waveform refers to its particular subcarrierspacing and cyclic prefix (CP) overhead. A scalable numerology refers tothe capability of the network to select different subcarrier spacings,and accordingly, with each spacing, to select the corresponding symbolduration, including the CP length. With a scalable numerology, a nominalsubcarrier spacing (SCS) may be scaled upward or downward by integermultiples. In this manner, regardless of CP overhead and the selectedSCS, symbol boundaries may be aligned at certain common multiples ofsymbols (e.g., aligned at the boundaries of each 1 ms subframe). Therange of SCS may include any suitable SCS. For example, a scalablenumerology may support a SCS ranging from 15 kHz to 480 kHz.

To illustrate this concept of a scalable numerology, FIG. 6 shows afirst RB 602 having a nominal numerology, and a second RB 604 having ascaled numerology. As one example, the first RB 602 may have a ‘nominal’subcarrier spacing (SCS_(n)) of 30 kHz, and a ‘nominal’ symbolduration_(n) of 333 μs. Here, in the second RB 604, the scalednumerology includes a scaled SCS of double the nominal SCS, or2×SCS_(n)=60 kHz. Because this provides twice the bandwidth per symbol,it results in a shortened symbol duration to carry the same information.Thus, in the second RB 604, the scaled numerology includes a scaledsymbol duration of half the nominal symbol duration, or (symbolduration_(n))÷2=167 μs.

Certain aspects of the present disclosure provide apparatus, methods,processing systems, and computer readable mediums for downlink controlinformation (DCI)-based or medium access control (MAC) control element(MAC-CE)-based dynamic updating of sounding reference signal (SRS)resource set content for reporting channel state information(CSI)-reference signal (RS) feedback. Various updates of SRS resourceset content may be configured and/or updated dynamically by a basestation (BS) using a radio access control (RRC) configuration. Forexample, for aperiodic CSI, a CSI-ResourceID field may be used toconfigured and/or dynamically update a UE with updated SRS resource setcontent using RRC signaling. The dynamically updated SRS resource setcontent may indicate, via an information element (IE), information suchas how to report CSI-RS measurement results (e.g., which beam to use orwhich resource set to use by indicating a resource set ID). Thedynamically updated SRS resource set content may also indicate the typeof CSI-RS to be transmitted (e.g., non-zero power (NZP) CSI-RS orinterference management (IM) CSI-RS). The dynamically updated SRSresource set content may indicate quasi-co location (QCL) information,which may indicate which beam is used for the transmission of theCSI-RS, allowing the UE to receive the CSI-RS more efficiently.

As described herein, in certain implementations, the dynamically updatedSRS resource set content may be activated using medium access control(MAC)-control element (CE). The dynamically updated SRS resource setcontent may introduce activation latency (e.g., 3 ms) for UE to applythe activation command Certain aspects of the present disclosure aredirected to DCI-based dynamically updated SRS resource set content. Forexample, dynamically updating SRS resource set content may be performedvia DCI. The dynamic updating of the SRS resource set content may beperformed using either a new DCI format or using an existing DCI format(e.g., format 0_1 or 0_2) by using reserved bits or configurable newfields. In certain aspects, an acknowledgment (ACK)/negative ACK (NAK)for receiving the DCI may be sent by the UE in uplink (UL) (e.g., viaphysical uplink control channel (PUCCH) or physical uplink sharedchannel (PUSCH)).

In certain aspects, the UE may report whether the UE supports DCI-baseddynamically updated SRS resource set content. In this case, thetransmission of the DCI dynamically updated SRS resource set content maybe in response to the UE's indication that the UE supports the DCI-baseddynamically updated SRS resource set content. In some cases, the BS mayindicate, to the UE, that DCI-based dynamically updated SRS resource setcontent is enabled, via RRC, MAC-CE, and/or DCI.

In some aspects, a user equipment (UE) may transmit to a base station asignal indicating a decoding capability of the UE. The UE may receivefrom the base station via at least one of a downlink control information(DCI) or a medium access control (MAC) control element (MAC-CE), aconfiguration of one or more sounding reference signal (SRS) resourcesets for SRS transmission. The UE may receive from the base station anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets. The UE may apply the update to at least one SRStransmission and transmit the at least one SRS transmission to the basestation according to the update at a time period after receiving atleast one of the DCI or the MAC-CE.

FIG. 7 is a diagram illustrating an example environment 700 forsignaling to dynamically update the configuration of a sound referencesignal (SRS) resource set according to some aspects. In the exampleshown in FIG. 7, a user equipment (UE) 702 is in wireless communicationwith a base station 704 over one or more wireless communication linksEach of the UE 702 and the base station 704 may correspond to any of theentities, gNodeBs, UEs, or the like as shown in FIGS. 1-4.

At 706, the UE 702 may transmit for reception by the base station 704 adecoding capability of the UE. The decoding capability of the scheduledentity may be used, for example, to determine a time period fortransmitting an SRS transmission. At 708, the UE 702 may receive fromthe base station 704, via at least one of a downlink control information(DCI) or a medium access control (MAC) control element (MAC-CE), aconfiguration of one or more sounding reference signal (SRS) resourcesets for SRS transmission. In some aspects, the at least one SRSresource set may include a resource type of one of aperiodic (AP),semi-persistent (SP), or periodic (P) for a non-codebook physical uplinkshared channel (PUSCH) transmission.

At 710, the UE 702 may receive from the base station 704 an indicationof an update of one or more parameters, via at least one of the DCI orthe MAC-CE, for at least one SRS resource set of the one or more SRSresource sets. For example, the UE 702 may receive from the base station704 a configuration of one or more sounding reference signal (SRS)resource sets for SRS transmission based on the decoding capability ofthe UE 702. In some aspects, the one or more parameters may include anupdated time period for the UE 702 to transmit an SRS transmission. Theupdated time period may be based on the decoding capability of the UE702 that was transmitted from the UE 702 to the base station 704. Insome aspects, the one or more parameters may include a non-zero power(NZP) channel state information reference signal (NZP CSI-RS)identification (NZP CSI-RS ID) associated with the at least one SRSresource set.

At 712, the UE 702 may apply the update to at least one SRStransmission. For example, after receiving the update of the one or moreparameters from the base station 704, the UE 702 may update the one ormore parameters such as a non-zero power (NZP) channel state informationreference signal (NZP CSI-RS) identification (NZP CSI-RS ID) associatedwith the at least one SRS resource set. At 714, the UE 702 may transmitfor reception by the base station 704 the SRS transmission based on theupdate. For example, if the indication of the update is received by theUE 702 via at least the DCI or the MAC-CE, the UE 702 may transmit theat least one SRS transmission to the base station 704 according to theupdate at a time period after receiving at least one of the DCI or theMAC-CE. In some aspects, the time period is a function of a framenumerology of at least one of a physical downlink control channel(PDCCH) carrying the DCI, a physical downlink shared channel (PDSCH)carrying the MAC-CE, or the at least one SRS resource set. In someaspects, the time period is a function of a decoding capability of theUE 702. In some aspects, the time period is conveyed from the basestation 704 to the UE 702 in one of the DCI or the MAC-CE. In someaspects, the UE 702 may apply the update to a transmission of the atleast one SRS transmission after a time period that is based on whetherthe update is conveyed in the DCI or the MAC-CE.

FIG. 8 is a block diagram illustrating an example of a hardwareimplementation for a scheduled entity 800 employing a processing system814. For example, the scheduled entity 800 may be any of the userequipment (UEs) illustrated in any one or more of FIGS. 1-4 and 7.

The scheduled entity 800 may be implemented with a processing system 814that includes one or more processors 804. Examples of processors 804include microprocessors, microcontrollers, digital signal processors(DSPs), field programmable gate arrays (FPGAs), programmable logicdevices (PLDs), state machines, gated logic, discrete hardware circuits,and other suitable hardware configured to perform the variousfunctionality described throughout this disclosure. In various examples,the scheduled entity 800 may be configured to perform any one or more ofthe functions described herein. That is, the processor 804, as utilizedin the scheduled entity 800, may be used to implement any one or more ofthe processes described herein. The processor 804 may in some instancesbe implemented via a baseband or modem chip and in otherimplementations, the processor 804 may itself comprise a number ofdevices distinct and different from a baseband or modem chip (e.g., insuch scenarios is may work in concert to achieve aspects discussedherein). And as mentioned above, various hardware arrangements andcomponents outside of a baseband modem processor can be used inimplementations, including RF-chains, power amplifiers, modulators,buffers, interleavers, adders/summers, etc.

In this example, the processing system 814 may be implemented with a busarchitecture, represented generally by the bus 802. The bus 802 mayinclude any number of interconnecting buses and bridges depending on thespecific application of the processing system 814 and the overall designconstraints. The bus 802 communicatively couples together variouscircuits including one or more processors (represented generally by theprocessor 804), and computer-readable media (represented generally bythe computer-readable storage medium 806). The bus 802 may also linkvarious other circuits such as timing sources, peripherals, voltageregulators, and power management circuits, which are well known in theart, and therefore, will not be described any further. A bus interface808 provides an interface between the bus 802 and a transceiver 810. Thetransceiver 810 provides a means for communicating with various otherapparatus over a transmission medium (e.g., air interface). A userinterface 812 (e.g., keypad, display, speaker, microphone, joystick) mayalso be provided.

The processor 804 is responsible for managing the bus 802 and generalprocessing, including the execution of software stored on thecomputer-readable storage medium 806. The software, when executed by theprocessor 804, causes the processing system 814 to perform the variousfunctions described herein for any particular apparatus. Thecomputer-readable storage medium 806 may also be used for storing datathat is manipulated by the processor 804 when executing software.

One or more processors 804 in the processing system may executesoftware. Software shall be construed broadly to mean instructions,instruction sets, code, code segments, program code, programs,subprograms, software modules, applications, software applications,software packages, routines, subroutines, objects, executables, threadsof execution, procedures, functions, etc., whether referred to assoftware, firmware, middleware, microcode, hardware descriptionlanguage, or otherwise. The software may reside on a computer-readablestorage medium 806.

The computer-readable storage medium 806 may be a non-transitorycomputer-readable medium. A non-transitory computer-readable mediumincludes, by way of example, a magnetic storage device (e.g., hard disk,floppy disk, magnetic strip), an optical disk (e.g., a compact disc (CD)or a digital versatile disc (DVD)), a smart card, a flash memory device(e.g., a card, a stick, or a key drive), a random access memory (RAM), aread only memory (ROM), a programmable ROM (PROM), an erasable PROM(EPROM), an electrically erasable PROM (EEPROM), a register, a removabledisk, and any other suitable medium for storing software and/orinstructions that may be accessed and read by a computer. Thecomputer-readable storage medium 806 may reside in the processing system814, external to the processing system 814, or distributed acrossmultiple entities including the processing system 814. Thecomputer-readable storage medium 806 may be embodied in a computerprogram product. By way of example, a computer program product mayinclude a computer-readable medium in packaging materials. Those skilledin the art will recognize how best to implement the describedfunctionality presented throughout this disclosure depending on theparticular application and the overall design constraints imposed on theoverall system.

In some aspects of the disclosure, the processor 804 may includecircuitry configured for various functions. For example, the processor804 may include receiving circuitry 840 configured to receive from abase station, via at least one of a downlink control information (DCI)or a medium access control (MAC) control element (MAC-CE), aconfiguration of one or more sounding reference signal (SRS) resourcesets for SRS transmission. The receiving circuitry 840 may also beconfigured to receiving an indication of an update of one or moreparameters, via at least one of the DCI or the MAC-CE, for at least oneSRS resource set of the one or more SRS resource sets. The receivingcircuitry 840 may be configured to execute receiving instructions 850stored in the computer-readable storage medium 806 to implement any ofthe one or more of the functions described herein.

The processor 804 may also include applying circuitry 842 configured toapply the update to at least one SRS transmission. The applyingcircuitry 842 may be configured to execute applying instructions 852stored in the computer-readable storage medium 806 to implement any ofthe one or more of the functions described herein.

The processor 804 may further include transmitting circuitry 844configured to transmit the at least one SRS transmission to the basestation according to the update at a time period after receiving atleast one of the DCI or the MAC-CE. The transmitting circuitry 844 mayalso be configured to transmitting an indication of the decodingcapability of the UE to a base station. The transmitting circuitry 844may be configured to execute transmitting instructions 854 stored in thecomputer-readable storage medium 806 to implement any of the one or moreof the functions described herein.

FIG. 9 is a flow chart 900 of a method for signaling to dynamicallyupdate the configuration of a SRS resource set according to someaspects. As described below, some or all illustrated features may beomitted in a particular implementation within the scope of the presentdisclosure, and some illustrated features may not be required forimplementation of all aspects. In some examples, the method may beperformed by the scheduled entity 800, as described herein, andillustrated in FIG. 8, by a processor or processing system, or by anysuitable means for carrying out the described functions.

At block 902, the scheduled entity 800 may receive from a base station,via at least one of a downlink control information (DCI) or a mediumaccess control (MAC) control element (MAC-CE), a configuration of one ormore sounding reference signal (SRS) resource sets for SRS transmission.In some aspects, the at least one SRS resource set comprises a resourcetype of one of aperiodic (AP), semi-persistent (SP), or periodic (P) fora non-codebook physical uplink shared channel (PUSCH) transmission. Thereceiving circuitry 840 together with the transceiver 810, shown anddescribed above in connection with FIG. 8 may provide a means to receivefrom a base station, via at least one of a DCI or a MAC-CE, aconfiguration of one or more SRS resource sets for SRS transmission.

At block 904, the scheduled entity 800 may receive an indication of anupdate of one or more parameters, via at least one of the DCI or theMAC-CE, for at least one SRS resource set of the one or more SRSresource sets. For example, the scheduled entity 800 may receive from abase station a configuration of one or more sounding reference signal(SRS) resource sets for SRS transmission based on the decodingcapability of the scheduled entity 800. In some aspects, the one or moreparameters may include an updated time period for the scheduled entity800 to transmit an SRS transmission. The updated time period may bebased on the decoding capability of the scheduled entity 800 that wastransmitted from the scheduled entity 800 to the base station. In someaspects, the one or more parameters comprise a non-zero power (NZP)channel state information reference signal (NZP CSI-RS) identification(NZP CSI-RS ID) associated with the at least one SRS resource set. Thereceiving circuitry 840 together with the transceiver 810, shown anddescribed above in connection with FIG. 8 may provide a means to receivean indication of an update of one or more parameters, via at least oneof the DCI or the MAC-CE, for at least one SRS resource set of the oneor more SRS resource sets.

At block 906, the scheduled entity 800 may apply the update to at leastone SRS transmission. For example, after receiving the update of the oneor more parameters from the base station 704, the scheduled entity 800may update the one or more parameters such as a non-zero power (NZP)channel state information reference signal (NZP CSI-RS) identification(NZP CSI-RS ID) associated with the at least one SRS resource set. Theapplying circuitry 842, shown and described above in connection withFIG. 8 may provide a means to apply the update to at least one SRStransmission.

In one configuration, the scheduled entity 800 includes means forperforming the various functions and processes described in relation toFIG. 9. In one aspect, the aforementioned means may be the processor 804shown in FIG. 8 configured to perform the functions recited by theaforementioned means. In another aspect, the aforementioned means may bea circuit or any apparatus configured to perform the functions recitedby the aforementioned means.

Of course, in the above examples, the circuitry included in theprocessor 804 is merely provided as an example, and other means forcarrying out the described functions may be included within variousaspects of the present disclosure, including but not limited to theinstructions stored in the computer-readable storage medium 806, or anyother suitable apparatus or means described in any one of the FIGS. 1-4and 7 and utilizing, for example, the processes and/or algorithmsdescribed herein in relation to FIG. 9.

FIG. 10 is a flow chart 1000 of a method for signaling to dynamicallyupdate the configuration of a SRS resource set according to someaspects. As described below, some or all illustrated features may beomitted in a particular implementation within the scope of the presentdisclosure, and some illustrated features may not be required forimplementation of all aspects. In some examples, the method may beperformed by the scheduled entity 800, as described herein, andillustrated in FIG. 8, by a processor or processing system, or by anysuitable means for carrying out the described functions.

At block 1002, the scheduled entity 800 may transmit an indication of adecoding capability of the scheduled entity 800 to a base station. Thedecoding capability of the scheduled entity may be used, for example, todetermine a time period for transmitting an SRS transmission. Thetransmitting circuitry 844 together with the transceiver 810, shown anddescribed above in connection with FIG. 8 may provide a means totransmit an indication of a decoding capability of the scheduled entity800 to a base station.

At block 1004, the scheduled entity 800 may receive from a base station,via at least one of a downlink control information (DCI) or a mediumaccess control (MAC) control element (MAC-CE), a configuration of one ormore sounding reference signal (SRS) resource sets for SRS transmission.The features of block 1004 may include one or more same or similarfeatures as the features described herein at least with respect to block902 of FIG. 9. At block 1006, the scheduled entity 800 may receive anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets. The features of block 1006 may include one ormore same or similar features as the features described herein at leastwith respect to block 904 of FIG. 9. At block 1008, the scheduled entity800 may apply the update to at least one SRS transmission. The featuresof block 1008 may include one or more same or similar features as thefeatures described herein at least with respect to block 906 of FIG. 9.

At block 1002, the scheduled entity 800 may transmit an SRS transmissionto the base station according to the updated at a time period afterreceiving at least one of the DCI or the MAC-CE. For example, if theindication of the update is received by the scheduled entity 800 via atleast the DCI or the MAC-CE, the scheduled entity 800 may transmit theat least one SRS transmission to the base station according to theupdate at a time period after receiving at least one of the DCI or theMAC-CE. In some aspects, the time period is a function of a framenumerology of at least one of a physical downlink control channel(PDCCH) carrying the DCI, a physical downlink shared channel (PDSCH)carrying the MAC-CE, or the at least one SRS resource set. In someaspects, the time period is a function of a decoding capability of thescheduled entity 800. In some aspects, the time period is conveyed fromthe base station to the scheduled entity 800 in one of the DCI or theMAC-CE. In some aspects, the scheduled entity 800 may apply the updateto a transmission of the at least one SRS transmission after a timeperiod that is based on whether the update is conveyed in the DCI or theMAC-CE. The transmitting circuitry 844 together with the transceiver810, shown and described above in connection with FIG. 8 may provide ameans to transmit an SRS transmission to the base station according tothe updated at a time period after receiving at least one of the DCI orthe MAC-CE.

In one configuration, the scheduled entity 800 includes means forperforming the various functions and processes described in relation toFIG. 10. In one aspect, the aforementioned means may be the processor804 shown in FIG. 8 configured to perform the functions recited by theaforementioned means. In another aspect, the aforementioned means may bea circuit or any apparatus configured to perform the functions recitedby the aforementioned means.

Of course, in the above examples, the circuitry included in theprocessor 804 is merely provided as an example, and other means forcarrying out the described functions may be included within variousaspects of the present disclosure, including but not limited to theinstructions stored in the computer-readable storage medium 806, or anyother suitable apparatus or means described in any one of the FIGS. 1-4and 7 and utilizing, for example, the processes and/or algorithmsdescribed herein in relation to FIG. 10.

FIG. 11 is a block diagram illustrating an example of a hardwareimplementation for a scheduling entity 1100 employing a processingsystem 1114 according to some aspects. For example, the schedulingentity 1400 may correspond to any of the UEs shown and described hereinin any one or more of FIGS. 1-4 and 7.

In accordance with various aspects of the disclosure, an element, or anyportion of an element, or any combination of elements may be implementedwith a processing system 1114 that includes one or more processors 1104.The processing system 1114 may be substantially the same as theprocessing system 814 illustrated in FIG. 8, including a bus interface1108, a bus 1102, a processor 1104, and a computer-readable storagemedium 1106. Furthermore, the scheduling entity 1100 may include a userinterface 1112 and a transceiver 1110 substantially similar to thosedescribed above in FIG. 8. That is, the processor 1104, as utilized inthe scheduling entity 1100, may be used to implement any one or more ofthe processes described herein.

In some aspects of the disclosure, the processor 1104 may includecircuitry configured for various functions. For example, the processor1104 may include transmitting circuitry 1140 configured to transmit to auser equipment (UE), via at least one of a downlink control information(DCI) or a medium access control (MAC) control element (MAC-CE), aconfiguration of one or more sounding reference signal (SRS) resourcesets for SRS transmission. The transmitting circuitry 1140 may also beconfigured to transmit, to the UE, an indication of an update of one ormore parameters, via at least one of the DCI or the MAC-CE, for at leastone SRS resource set of the one or more SRS resource sets. Thetransmitting circuitry 1140 may be configured to execute transmittinginstructions 1150 stored in the computer-readable storage medium 1106 toimplement any of the one or more of the functions described herein.

The processor 1104 may also include receiving circuitry 1142 configuredto receive one or more SRS transmissions from the UE in accordance withthe update. The receiving circuitry 1142 may also be configured toreceive, from the UE, a signal indicating the decoding capability of theUE. The receiving circuitry 1142 may be configured to execute receivinginstructions 1152 stored in the computer-readable storage medium 1106 toimplement any of the one or more of the functions described herein.

FIG. 12 is a flow chart 1200 of a method for signaling to dynamicallyupdate the configuration of a SRS resource set according to someaspects. As described below, some or all illustrated features may beomitted in a particular implementation within the scope of the presentdisclosure, and some illustrated features may not be required forimplementation of all aspects. In some examples, the method may beperformed by the scheduling entity 1100, as described herein, andillustrated in FIG. 11, by a processor or processing system, or by anysuitable means for carrying out the described functions.

At block 1202, the scheduling entity 1100 may transmit to a userequipment (UE), via at least one of a downlink control information (DCI)or a medium access control (MAC) control element (MAC-CE), aconfiguration of one or more sounding reference signal (SRS) resourcesets for SRS transmission. For example, the scheduling entity 1100 mayhave received from a UE a decoding capability of the UE. The decodingcapability of the UE may be used, for example, to determine by thescheduling entity 1100 a time period for the UE to transmit an SRStransmission. The UE may also receive from the scheduling entity 1100,via at least one of a downlink control information (DCI) or a mediumaccess control (MAC) control element (MAC-CE), a configuration of one ormore sounding reference signal (SRS) resource sets for SRS transmission.In some aspects, the at least one SRS resource set comprises a resourcetype of one of aperiodic (AP), semi-persistent (SP), or periodic (P) fora non-codebook physical uplink shared channel (PUSCH) transmission. Thetransmitting circuitry 1140 together with the transceiver 1110, shownand described above in connection with FIG. 11 may provide a means totransmit to a user equipment (UE), via at least one of a downlinkcontrol information (DCI) or a medium access control (MAC) controlelement (MAC-CE), a configuration of one or more sounding referencesignal (SRS) resource sets for SRS transmission.

At block 1204, the scheduling entity 1100 may transmit, to the UE, anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets. For example, the scheduling entity 1100 maytransmit to the UE a configuration of one or more sounding referencesignal (SRS) resource sets for SRS transmission based on the decodingcapability of the UE. In some aspects, the one or more parameters mayinclude an updated time period for the UE to transmit an SRStransmission to the scheduling entity 1100. The updated time period maybe based on the decoding capability of the UE that was transmitted fromthe UE to the scheduling entity 1100. In some aspects, the one or moreparameters comprise a non-zero power (NZP) channel state informationreference signal (NZP CSI-RS) identification (NZP CSI-RS ID) associatedwith the at least one SRS resource set. The transmitting circuitry 1140together with the transceiver 1110, shown and described above inconnection with FIG. 11 may provide a means to transmit, to the UE, anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets.

At block 1206, the scheduling entity 1100 may receive one or more SRStransmissions from the UE in accordance with the update. For example,after the scheduling entity 1100 transmits the update of the one or moreparameters from the base station 704, the UE may update the one or moreparameters such as a non-zero power (NZP) channel state informationreference signal (NZP CSI-RS) identification (NZP CSI-RS ID) associatedwith the at least one SRS resource set. The UE may then transmit forreception by the scheduling entity 1100 the SRS transmission based onthe update. If the indication of the update is received by the UE via atleast the DCI or the MAC-CE, the UE may transmit the at least one SRStransmission to the scheduling entity 1100 according to the update at atime period after receiving at least one of the DCI or the MAC-CE. Insome aspects, the time period is a function of a frame numerology of atleast one of a physical downlink control channel (PDCCH) carrying theDCI, a physical downlink shared channel (PDSCH) carrying the MAC-CE, orthe at least one SRS resource set. In some aspects, the time period is afunction of a decoding capability of the UE. In some aspects, the timeperiod is conveyed from the scheduling entity 1100 to the UE in one ofthe DCI or the MAC-CE. In some aspects, the UE may apply the update to atransmission of the at least one SRS transmission after a time periodthat is based on whether the update is conveyed in the DCI or theMAC-CE. The receiving circuitry 1142 together with the transceiver 1110,shown and described above in connection with FIG. 11 may provide a meansto receive one or more SRS transmissions from the UE in accordance withthe update.

In one configuration, the scheduling entity 1100 includes means forperforming the various functions and processes described in relation toFIG. 12. In one aspect, the aforementioned means may be the processor1104 shown in FIG. 11 configured to perform the functions recited by theaforementioned means. In another aspect, the aforementioned means may bea circuit or any apparatus configured to perform the functions recitedby the aforementioned means.

Of course, in the above examples, the circuitry included in theprocessor 1104 is merely provided as an example, and other means forcarrying out the described functions may be included within variousaspects of the present disclosure, including but not limited to theinstructions stored in the computer-readable storage medium 1106, or anyother suitable apparatus or means described in any one of the FIGS. 1-4and 7 and utilizing, for example, the processes and/or algorithmsdescribed herein in relation to FIG. 12.

FIG. 13 is a flow chart 1300 of a method for signaling to dynamicallyupdate the configuration of a SRS resource set according to someaspects. As described below, some or all illustrated features may beomitted in a particular implementation within the scope of the presentdisclosure, and some illustrated features may not be required forimplementation of all aspects. In some examples, the method may beperformed by the scheduling entity 1100, as described herein, andillustrated in FIG. 11, by a processor or processing system, or by anysuitable means for carrying out the described functions.

At block 1302, the scheduling entity 1100 may receive, from the UE, asignal indicating the decoding capability of the UE. The decodingcapability of the scheduled entity may be used, for example, todetermine a time period for transmitting an SRS transmission. Thereceiving circuitry 1142 together with the transceiver 1110, shown anddescribed above in connection with FIG. 11 may provide a means toreceive, from the UE, a signal indicating the decoding capability of theUE.

At block 1304, the scheduling entity 1100 may transmit to a userequipment (UE), via at least one of a downlink control information (DCI)or a medium access control (MAC) control element (MAC-CE), aconfiguration of one or more sounding reference signal (SRS) resourcesets for SRS transmission. The features of block 1304 may include one ormore same or similar features as the features described herein at leastwith respect to block 1202 of FIG. 12. At block 1306, the schedulingentity 1100 may transmit, to the UE, an indication of an update of oneor more parameters, via at least one of the DCI or the MAC-CE, for atleast one SRS resource set of the one or more SRS resource sets. Thefeatures of block 1306 may include one or more same or similar featuresas the features described herein at least with respect to block 1204 ofFIG. 12. At block 1308, the scheduling entity 1100 may receive one ormore SRS transmissions from the UE in accordance with the update. Thefeatures of block 1308 may include one or more same or similar featuresas the features described herein at least with respect to block 1206 ofFIG. 12.

In one configuration, the scheduling entity 1100 includes means forperforming the various functions and processes described in relation toFIG. 13. In one aspect, the aforementioned means may be the processor1104 shown in FIG. 11 configured to perform the functions recited by theaforementioned means. In another aspect, the aforementioned means may bea circuit or any apparatus configured to perform the functions recitedby the aforementioned means.

Of course, in the above examples, the circuitry included in theprocessor 1104 is merely provided as an example, and other means forcarrying out the described functions may be included within variousaspects of the present disclosure, including but not limited to theinstructions stored in the computer-readable storage medium 1106, or anyother suitable apparatus or means described in any one of the FIGS. 1-4and 7 and utilizing, for example, the processes and/or algorithmsdescribed herein in relation to FIG. 13.

In a first aspect, a user equipment (UE) for wireless communication mayreceive from a base station, via at least one of a downlink controlinformation (DCI) or a medium access control (MAC) control element(MAC-CE), a configuration of one or more sounding reference signal (SRS)resource sets for SRS transmission. The UE may also receive anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets. The UE may further apply the update to at leastone SRS transmission.

In a second aspect, alone or in combination with the first aspect, theone or more parameters may include a non-zero power (NZP) channel stateinformation reference signal (NZP CSI-RS) identification (NZP CSI-RS ID)associated with the at least one SRS resource set.

In a third aspect, alone or in combination with one or more of the firstand second aspects, the at least one SRS resource set may include aresource type of one of aperiodic (AP), semi-persistent (SP), orperiodic (P) for a non-codebook physical uplink shared channel (PUSCH)transmission.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the UE may further, if the indication ofthe update is received via at least the DCI or the MAC-CE, transmit theat least one SRS transmission to the base station according to theupdate at a time period after receiving at least one of the DCI or theMAC-CE.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the time period may be a function of a framenumerology of at least one of a physical downlink control channel(PDCCH) carrying the DCI, a physical downlink shared channel (PDSCH)carrying the MAC-CE, or the at least one SRS resource set.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, the time period may be a function of a decodingcapability of the UE.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, the UE may further transmit an indicationof the decoding capability of the UE to the base station.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, the time period may be conveyed in one ofthe DCI or the MAC-CE.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, the update may be applied to a transmission ofthe at least one SRS transmission after a time period that is based onwhether the update is conveyed in the DCI or the MAC-CE.

In a tenth aspect, a base station may transmit to a user equipment (UE),via at least one of a downlink control information (DCI) or a mediumaccess control (MAC) control element (MAC-CE), a configuration of one ormore sounding reference signal (SRS) resource sets for SRS transmission.The base station may also transmit, to the UE, an indication of anupdate of one or more parameters, via at least one of the DCI or theMAC-CE, for at least one SRS resource set of the one or more SRSresource sets. The base station may further receive one or more SRStransmissions from the UE in accordance with the update.

In an eleventh aspect, alone or in combination with the tenth aspect,the one or more parameters may include a non-zero power (NZP) channelstate information reference signal (NZP CSI-RS) identification (NZPCSI-RS ID) associated with the at least one SRS resource set.

In a twelfth aspect, alone or in combination with one or more of thetenth through eleventh aspects, the at least one SRS resource setcomprises a resource type of one of aperiodic (AP), semi-persistent(SP), or periodic (P) for a non-codebook physical uplink shared channel(PUSCH) transmission.

In a thirteenth aspect, alone or in combination with one or more of thetenth through twelfth aspects, the base station receiving the one ormore SRS transmissions from the UE in accordance with the update mayinclude receiving the one or more SRS transmission from the UE inaccordance with the update at a time period after receiving one of theDCI or the MAC-CE.

In a fourteenth aspect, alone or in combination with one or more of thetenth through thirteenth aspects, the time period may be a function of aframe numerology of at least one of a physical downlink control channel(PDCCH) carrying the DCI, a physical downlink shared channel (PDSCH)carrying the MAC-CE, or the at least one SRS resource set.

In a fifteenth aspect, alone or in combination with one or more of thetenth through fourteenth aspects, the base station may further receive,from the UE, a signal indicating the decoding capability of the UE.

In one configuration, a user equipment (UE) may include means forreceiving from a base station, via at least one of a downlink controlinformation (DCI) or a medium access control (MAC) control element(MAC-CE), a configuration of one or more sounding reference signal (SRS)resource sets for SRS transmission, means for receiving an indication ofan update of one or more parameters, via at least one of the DCI or theMAC-CE, for at least one SRS resource set of the one or more SRSresource sets, and means for applying the update to at least one SRStransmission.

In one aspect, the aforementioned means for receiving from a basestation, via at least one of a downlink control information (DCI) or amedium access control (MAC) control element (MAC-CE), a configuration ofone or more sounding reference signal (SRS) resource sets for SRStransmission, means for receiving an indication of an update of one ormore parameters, via at least one of the DCI or the MAC-CE, for at leastone SRS resource set of the one or more SRS resource sets, and means forapplying the update to at least one SRS transmission may be theprocessor(s) 804 shown in FIG. 8 configured to perform the functionsrecited by the aforementioned means. For example, the aforementionedmeans for receiving from a base station, via at least one of a downlinkcontrol information (DCI) or a medium access control (MAC) controlelement (MAC-CE), a configuration of one or more sounding referencesignal (SRS) resource sets for SRS transmission may include thereceiving circuitry 840 together with the transceiver 810 shown in FIG.8. As another example, the aforementioned means for receiving anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets may include the receiving circuitry 840 togetherwith the transceiver 810 shown in FIG. 8. As yet another example, theaforementioned means for applying the update to at least one SRStransmission may include the applying circuitry 842 shown in FIG. 8. Inanother aspect, the aforementioned means may be a circuit or anyapparatus configured to perform the functions recited by theaforementioned means.

In one configuration, a base station may include means for transmittingto a user equipment (UE), via at least one of a downlink controlinformation (DCI) or a medium access control (MAC) control element(MAC-CE), a configuration of one or more sounding reference signal (SRS)resource sets for SRS transmission, means for transmitting, to the UE,an indication of an update of one or more parameters, via at least oneof the DCI or the MAC-CE, for at least one SRS resource set of the oneor more SRS resource sets, and means for receiving one or more SRStransmissions from the UE in accordance with the update.

In one aspect, the aforementioned means for transmitting to a userequipment (UE), via at least one of a downlink control information (DCI)or a medium access control (MAC) control element (MAC-CE), aconfiguration of one or more sounding reference signal (SRS) resourcesets for SRS transmission, means for transmitting, to the UE, anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets, and means for receiving one or more SRStransmissions from the UE in accordance with the update may be theprocessor(s) 1104 shown in FIG. 11 configured to perform the functionsrecited by the aforementioned means. For example, the aforementionedmeans for transmitting to a user equipment (UE), via at least one of adownlink control information (DCI) or a medium access control (MAC)control element (MAC-CE), a configuration of one or more soundingreference signal (SRS) resource sets for SRS transmission may includethe transmitting circuitry 1140 together with the transceiver 1110 shownin FIG. 11. As another example, the aforementioned means fortransmitting, to the UE, an indication of an update of one or moreparameters, via at least one of the DCI or the MAC-CE, for at least oneSRS resource set of the one or more SRS resource sets may include thetransmitting circuitry 1140 together with the transceiver 1110 shown inFIG. 11. As yet another example, the aforementioned means for receivingone or more SRS transmissions from the UE in accordance with the updatemay include the receiving circuitry 1144 together with the transceiver1110 shown in FIG. 11. In another aspect, the aforementioned means maybe a circuit or any apparatus configured to perform the functionsrecited by the aforementioned means.

Several aspects of a wireless communication network have been presentedwith reference to an exemplary implementation. As those skilled in theart will readily appreciate, various aspects described throughout thisdisclosure may be extended to other telecommunication systems, networkarchitectures and communication standards.

By way of example, various aspects may be implemented within othersystems defined by 3GPP, such as Long-Term Evolution (LTE), the EvolvedPacket System (EPS), the Universal Mobile Telecommunication System(UMTS), and/or the Global System for Mobile (GSM). Various aspects mayalso be extended to systems defined by the 3rd Generation PartnershipProject 2 (3GPP2), such as CDMA2000 and/or Evolution-Data Optimized(EV-DO). Other examples may be implemented within systems employing IEEE802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Ultra-Wideband (UWB),Bluetooth, and/or other suitable systems. The actual telecommunicationstandard, network architecture, and/or communication standard employedwill depend on the specific application and the overall designconstraints imposed on the system.

Within the present disclosure, the word “exemplary” is used to mean“serving as an example, instance, or illustration.” Any implementationor aspect described herein as “exemplary” is not necessarily to beconstrued as preferred or advantageous over other aspects of thedisclosure. Likewise, the term “aspects” does not require that allaspects of the disclosure include the discussed feature, advantage, ormode of operation. The term “coupled” is used herein to refer to thedirect or indirect coupling between two objects. For example, if objectA physically touches object B, and object B touches object C, thenobjects A and C may still be considered coupled to one another—even ifthey do not directly physically touch each other. For instance, a firstobject may be coupled to a second object even though the first object isnever directly physically in contact with the second object. The terms“circuit” and “circuitry” are used broadly, and intended to include bothhardware implementations of electrical devices and conductors that, whenconnected and configured, enable the performance of the functionsdescribed in the present disclosure, without limitation as to the typeof electronic circuits, as well as software implementations ofinformation and instructions that, when executed by a processor, enablethe performance of the functions described in the present disclosure.

One or more of the components, steps, features and/or functionsillustrated in FIGS. 1-18 may be rearranged and/or combined into asingle component, step, feature, or function or embodied in severalcomponents, steps, or functions. Additional stages, components, steps,and/or functions may also be added without departing from novel featuresdisclosed herein. The apparatus, devices, and/or components illustratedin FIGS. 1-18 may be configured to perform one or more of the methods,features, or steps described herein. The novel algorithms describedherein may also be efficiently implemented in software and/or embeddedin hardware.

It is to be understood that the specific order or hierarchy of steps inthe methods disclosed is an illustration of exemplary processes. Basedupon design preferences, it is understood that the specific order orhierarchy of steps in the methods may be rearranged. The accompanyingmethod claims present stages of the various steps in a sample order andare not meant to be limited to the specific order or hierarchy presentedunless specifically recited therein.

The previous description is provided to enable any person skilled in theart to practice the various aspects described herein. Variousmodifications to these aspects will be readily apparent to those skilledin the art, and the generic principles defined herein may be applied toother aspects. Thus, the claims are not intended to be limited to theaspects shown herein, but are to be accorded the full scope consistentwith the language of the claims, wherein reference to an stage in thesingular is not intended to mean “one and only one” unless specificallyso stated, but rather “one or more.” Unless specifically statedotherwise, the term “some” refers to one or more. A phrase referring to“at least one of” a list of items refers to any combination of thoseitems, including single members. As an example, “at least one of: a, b,or c” is intended to cover: a; b; c; a and b; a and c; b and c; and a,b, and c. All structural and functional equivalents to the stages of thevarious aspects described throughout this disclosure that are known orlater come to be known to those of ordinary skill in the art areexpressly incorporated herein by reference and are intended to beencompassed by the claims. Moreover, nothing disclosed herein isintended to be dedicated to the public regardless of whether suchdisclosure is explicitly recited in the claims.

What is claimed is:
 1. A method for wireless communication by a userequipment (UE), comprising: receiving from a base station, via at leastone of a downlink control information (DCI) or a medium access control(MAC) control element (MAC-CE), a configuration of one or more soundingreference signal (SRS) resource sets for SRS transmission; receiving anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets; and applying the update to at least one SRStransmission.
 2. The method of claim 1, wherein the one or moreparameters comprise a non-zero power (NZP) channel state informationreference signal (NZP CSI-RS) identification (NZP CSI-RS ID) associatedwith the at least one SRS resource set.
 3. The method of claim 2,wherein the at least one SRS resource set comprises a resource type ofone of aperiodic (AP), semi-persistent (SP), or periodic (P) for anon-codebook physical uplink shared channel (PUSCH) transmission.
 4. Themethod of claim 1, further comprising: if the indication of the updateis received via at least the DCI or the MAC-CE, transmitting the atleast one SRS transmission to the base station according to the updateat a time period after receiving at least one of the DCI or the MAC-CE.5. The method of claim 4, wherein the time period is a function of aframe numerology of at least one of a physical downlink control channel(PDCCH) carrying the DCI, a physical downlink shared channel (PDSCH)carrying the MAC-CE, or the at least one SRS resource set.
 6. The methodof claim 4, wherein the time period is a function of a decodingcapability of the UE.
 7. The method of claim 6, further comprising:transmitting an indication of the decoding capability of the UE to thebase station.
 8. The method of claim 1, wherein the update is applied toa transmission of the at least one SRS transmission after a time periodthat is based on whether the update is conveyed in the DCI or theMAC-CE.
 9. A user equipment (UE) for wireless communication in awireless communication system, comprising: a wireless transceiver; amemory; and a processor communicatively coupled to the wirelesstransceiver and the memory, wherein the processor and the memory areconfigured to: receive from a base station, via at least one of adownlink control information (DCI) or a medium access control (MAC)control element (MAC-CE), a configuration of one or more soundingreference signal (SRS) resource sets for SRS transmission, receive anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets, and apply the update to at least one SRStransmission.
 10. The UE of claim 9, wherein the one or more parameterscomprise a non-zero power (NZP) channel state information referencesignal (NZP CSI-RS) identification (NZP CSI-RS ID) associated with theat least one SRS resource set.
 11. The UE of claim 10, wherein the atleast one SRS resource set comprises a resource type of one of aperiodic(AP), semi-persistent (SP), or periodic (P) for a non-codebook physicaluplink shared channel (PUSCH) transmission.
 12. The UE of claim 11,wherein the processor and the memory are further configured to: if theindication of the update is received via at least the DCI or the MAC-CE,transmit the at least one SRS transmission to the base station accordingto the update at a time period after receiving at least one of the DCIor the MAC-CE.
 13. The UE of claim 12, wherein the time period is afunction of a frame numerology of at least one of a physical downlinkcontrol channel (PDCCH) carrying the DCI, a physical downlink sharedchannel (PDSCH) carrying the MAC-CE, or the at least one SRS resourceset.
 14. The UE of claim 12, wherein the time period is a function of adecoding capability of the UE.
 15. The UE of claim 14, wherein theprocessor and the memory are further configured to: transmit anindication of the decoding capability of the UE to the base station. 16.The UE of claim 9, wherein the update is applied to a transmission ofthe at least one SRS transmission after a time period that is based onwhether the update is conveyed in the DCI or the MAC-CE.
 17. A methodfor wireless communication by a base station, comprising: transmittingto a user equipment (UE), via at least one of a downlink controlinformation (DCI) or a medium access control (MAC) control element(MAC-CE), a configuration of one or more sounding reference signal (SRS)resource sets for SRS transmission; transmitting, to the UE, anindication of an update of one or more parameters, via at least one ofthe DCI or the MAC-CE, for at least one SRS resource set of the one ormore SRS resource sets; and receiving one or more SRS transmissions fromthe UE in accordance with the update.
 18. The method of claim 17,wherein the one or more parameters comprise a non-zero power (NZP)channel state information reference signal (NZP CSI-RS) identification(NZP CSI-RS ID) associated with the at least one SRS resource set. 19.The method of claim 18, wherein the at least one SRS resource setcomprises a resource type of one of aperiodic (AP), semi-persistent(SP), or periodic (P) for a non-codebook physical uplink shared channel(PUSCH) transmission.
 20. The method of claim 17, wherein receiving theone or more SRS transmissions from the UE in accordance with the updatecomprises receiving the one or more SRS transmission from the UE inaccordance with the update at a time period after receiving one of theDCI or the MAC-CE.
 21. The method of claim 20, wherein the time periodis a function of a frame numerology of at least one of a physicaldownlink control channel (PDCCH) carrying the DCI, a physical downlinkshared channel (PDSCH) carrying the MAC-CE, or the at least one SRSresource set.
 22. The method of claim 20, wherein the time period is afunction of a decoding capability of the UE.
 23. The method of claim 22,further comprising: receiving, from the UE, a signal indicating thedecoding capability of the UE.
 24. A base station for wirelesscommunication in a wireless communication network, comprising: awireless transceiver; a memory; and a processor communicatively coupledto the wireless transceiver and the memory, wherein the processor andthe memory are configured to: transmit to a user equipment (UE), via atleast one of a downlink control information (DCI) or a medium accesscontrol (MAC) control element (MAC-CE), a configuration of one or moresounding reference signal (SRS) resource sets for SRS transmission,transmit, to the UE, an indication of an update of one or moreparameters, via at least one of the DCI or the MAC-CE, for at least oneSRS resource set of the one or more SRS resource sets, and receive oneor more SRS transmissions from the UE in accordance with the update. 25.The base station of claim 24, wherein the one or more parameterscomprise a non-zero power (NZP) channel state information referencesignal (NZP CSI-RS) identification (NZP CSI-RS ID) associated with theat least one SRS resource set.
 26. The base station of claim 25, whereinthe at least one SRS resource set comprises a resource type of one ofaperiodic (AP), semi-persistent (SP), or periodic (P) for a non-codebookphysical uplink shared channel (PUSCH) transmission.
 27. The basestation of claim 24, wherein receiving the one or more SRS transmissionsfrom the UE in accordance with the update comprises receiving the one ormore SRS transmission from the UE in accordance with the update at atime period after receiving one of the DCI or the MAC-CE.
 28. The basestation of claim 27, wherein the time period is a function of a framenumerology of at least one of a physical downlink control channel(PDCCH) carrying the DCI, a physical downlink shared channel (PDSCH)carrying the MAC-CE, or the at least one SRS resource set.
 29. The basestation of claim 27, wherein the time period is a function of a decodingcapability of the UE.
 30. The base station of claim 29, wherein theprocessor and the memory are configured to: receive, from the UE, asignal indicating the decoding capability of the UE.